Continuous carburizing furnace

a carburizing furnace and continuous technology, applied in furnaces, heat treatment equipment, charge manipulation, etc., can solve the problems of large number of hearth rollers, troublesome drive control, and considerable amount of thermal energy wasted,

Inactive Publication Date: 2010-11-30
KOYO THERMO SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution enables efficient energy use, simplified maintenance, and compact furnace design while maintaining high product quality by allowing precise temperature and atmosphere control across zones.

Problems solved by technology

However, with a continuous carburizing furnace which utilizes the roller hearth method, it is necessary to drive the large number of hearth rollers from the exterior, and a considerable amount of thermal energy is wasted by thermal diffusion from the side walls of the furnace in which the shafts of the hearth rollers are supported.
Furthermore, it becomes necessary to oscillate the hearth rollers by rotating them forwards and backwards periodically in order to prevent deflection of the hearth rollers due to the loadings imposed upon them from the trays, so that the drive control of the rollers becomes troublesome.
Moreover, the maintenance of this large number of hearth rollers also becomes complicated and troublesome.
However, a purge chamber which is provided with an intermediate door between itself and the heating zone is present at the transport entrance side of the furnace, and it is not possible to bring in the next tray to this purge chamber until the previous tray has been conveyed from the heating zone to the carburizing zone, so that the time period between bringing in trays becomes long.
However, in this case, the shape of the furnace in plan view cannot be made to be linear, so that the area which the device occupies is increased in size.

Method used

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Examples

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Embodiment Construction

[0015]In the following, an embodiment of the present invention will be described in concrete terms with reference to the drawing. FIG. 1 is a plane sectional view showing an example of a continuous carburizing furnace according to an embodiment of the present invention. And FIG. 2 is a side sectional view of this continuous carburizing furnace.

[0016]This continuous carburizing furnace 100 continuously performs, as one example, pre-processing, heating processing, carburizing processing, diffusion processing, cooling processing, and quenching processing upon workpieces which are loaded upon trays during conveyance along a conveyance path which is shaped as a straight line in plan view. This continuous carburizing furnace 100 is a continuous carburizing furnace employing a hybrid method, and conveys trays which are loaded with a large number of workpieces through pre-processing, heating processing, carburizing processing, and diffusion processing by a tray pusher method, and then conve...

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Abstract

A continuous carburizing furnace includes a furnace having a carburizing zone for performing a carburizing process on a workpiece while the workpiece is conveyed; and a plurality of regions disposed successively in a direction of conveyance upstream from the carburizing zone, the carburizing zone being provided with an intermediate door being opened and closed between the carburizing zone and the upstream side therefrom. Also included is at least a single lift mechanism for lowering the workpiece in a region other than a region of the most upstream side among the plurality of regions; and a plurality of pushers for pushing the workpiece at each of the plurality of regions to regions downstream therefrom or to the carburizing zone, the plurality of pushers being disposed so as to push the workpiece at successively lowered levels of height one after another in the direction of conveyance.

Description

CROSS REFERENCE[0001]This Non-provisional application claims priority under 35 U.S.C. ยง119(a) on Patent Application No. 2007-031780 filed in Japan on Feb. 13, 2007, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to a continuous carburizing furnace which performs a plurality of processes, including a carburizing process, successively upon a workpiece, the subject for processing, which is being conveyed in an ambient atmosphere which includes a carburizing gas.[0003]With a continuous carburizing furnace, a heating zone, a carburizing zone, a diffusion zone, a cooling zone, and so on are provided within the furnace. A workpiece which has been loaded upon a tray is subjected to processing in each of these zones, while the tray is conveyed from a transport entrance of the furnace towards a removal aperture thereof.[0004]As methods for conveying the workpiece within the furnace, both the tray pusher method a...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): C21D1/06
CPCC21D9/0018C21D9/0056C21D9/0062C21D9/667F27B9/028F27B9/045F27B9/18F27B9/22F27D3/0032F27D2003/0065
InventorTANAKA, YASUNORIMINAMIGUCHI, MASANORI
OwnerKOYO THERMO SYST CO LTD